1590s, from French antagoniste (16c.) or directly from Late Latin antagonista, from Greek antagonistes "competitor, opponent, rival," agent noun from antagonizesthai "to struggle against, oppose, be a rival," from anti- "against" (see anti-) + agonizesthai "to contend for a prize," from agon "contest" (see agony). Originally in battle or sport, extended 1620s to any sphere of human activity.

late 14c., antartyk "opposite to the north pole" (adj.), also (with capital A) "region around the South pole" (n.), from Old French antartique, from Medieval Latin antarcticus, from Greek antarktikos "opposite the north," from anti- "opposite" (see anti-) + arktikos "arctic" (see arctic). The first -c- sound ceased to be pronounced in Medieval Latin and was dropped in Old French. Modern English spelling, which restores it, dates from 17c.

continent name attributed to Scottish cartographer John George Bartholomew (1860-1920), who used it on a map published 1887. From antarctic (q.v.). Hypothetical southern continents had been imagined since antiquity; first sighting of Antarctica by Europeans probably was 1820 (Lazarev and Bellingshausen). Also compare Antipodes.

also ante-bellum, from Latin phrase ante bellum, literally "before the war;" see ante- + bellicose. In U.S., usually in reference to the American Civil War (1861-65); first attested in a June 14, 1862, entry in Mary Chesnut's diary.

early 15c., from Old French antelop, from Medieval Latin ant(h)alopus (11c.), from Greek antholops (attested in Eusebius of Antioch, c.336 C.E.), a fabulous animal haunting the banks of the Euphrates, very savage, hard to catch and having long saw-like horns capable of cutting down trees. Original sense and language unknown (it looks like Greek "flower-eye," as if from anthos + ops, but that may be a result of Greek folk etymology). A heraldic animal, also known in Medieval Latin as talopus and calopus, the name was applied c. 1600 to a living type of deer-like mammal. In the western U.S., it is used in reference to the pronghorn.

1640s, "feeler or horn of an insect," from Latin antenna "sail yard," the long yard that sticks up on some sails, which is of unknown origin, perhaps from PIE root *temp- "to stretch, extend." In the etymological sense, it is a loan-translation of Aristotle's Greek keraiai "horns" (of insects). Modern use in radio, etc., for "aerial wire" is from 1902. Adjectival forms are antennal (1834), antennary (1836), antennular (1858).

Old English ontemn, antefn, "a composition (in prose or verse) sung antiphonally," from Late Latin antefana, from Greek antiphona "verse response" (see antiphon). Sense evolved to "a composition set to sacred music" (late 14c.), then "song of praise or gladness" (1590s). Used in reference to the English national song (technically, as OED points out, a hymn) and extended to those of other nations. Modern spelling is from late 16c., perhaps an attempt to make the word look more Greek.

1630s, "collection of poetry," from Latin anthologia, from Greek anthologia "collection of small poems and epigrams by several authors," literally "flower-gathering," from anthos "a flower" (see anther) + logia "collection, collecting," from legein "gather" (see lecture (n.)). Modern sense (which emerged in Late Greek) is metaphoric, "flowers" of verse, small poems by various writers gathered together.

masc. proper name, from Latin Antonius, name of a Roman gens (with excrescent -h- probably suggested by many Greek loan words beginning anth-, such as anthros "flower," anthropos "man"); St. Anthony (4c.), Egyptian hermit, patron saint of swineherds, to whom one of each litter was usually vowed, hence Anthony for "smallest pig of the litter (1660s; in condensed form tantony pig from 1590s). St. Anthony's Fire (1520s), popular name for erysipelas, is said to be so called from the tradition that those who sought his intercession recovered from that distemper during a fatal epidemic in 1089.

late 14c., "any severe boil or carbuncle," from Latin, from Greek anthrax "charcoal, live coal," also "carbuncle," which is of unknown origin. Specific sense of the malignant disease in sheep and cattle (and occasionally humans) is from 1876.

before a vowel, anthrop-, word-forming element meaning "pertaining to man or human beings," from Greek anthropos "man, human being" (sometimes also including women) from Attic andra (genitive andros), from Greek aner "man" (as opposed to a woman, a god, or a boy), from PIE *ner- (2) "man," also "vigorous, vital, strong" (source also of Sanskrit nar-, Armenian ayr, Welsh ner).

Anthropos sometimes is explained as a compound of aner and ops (genitive opos) "eye, face;" so literally "he who has the face of a man." The change of -d- to -th- is difficult to explain; perhaps it is from some lost dialectal variant, or the mistaken belief that there was an aspiration sign over the vowel in the second element (as though *-dhropo-), which mistake might have come about by influence of common verbs such as horao "to see."